Cyrtocrinida is an order of sea lilies which contains two suborders and three families.
| Cyrtocrinida | |
|---|---|
| |
| Holopus sp. | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | Cyrtocrinida[1]
|
Characteristics
editMembers of this order have stems consisting of a single skeletal unit or a very small number of units. There are no cirri, and the expanded base of the stem attaches directly to the substrate. The calyx may be asymmetrical and consists of five arms attached to five radial ossicles. The arms subdivide at arm ossicle I or II.[2]
Families
editThe World Register of Marine Species includes the following groups in the order:[1]
- Suborder Cyrtocrinina
- Family Sclerocrinidae Jaekel, 1918
- Suborder Holopodina
- Family Eudesicrinidae Bather, 1899
- Family Holopodidae Zittel, 1879
References
edit- ^ a b Messing, Charles (2013). "Cyrtocrinida". WoRMS. World Register of Marine Species. Retrieved 13 March 2019.
- ^ O'Hara, Timothy; Byrne, Maria (2017). Australian Echinoderms: Biology, Ecology and Evolution. Csiro Publishing. pp. 191–192. ISBN 978-1-4863-0763-0.
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